LATIN DICTIONARYLexicon Latīnum
proper noun · masculinevariously declined, third declension, first declension

Orestēs

Orestēs m sg (genitive Orestis or Orestae or Orestī)
Classical[ɔˈrɛs.teːs]Ecclesiastical[oˈrɛs.tes]

Meaning

  1. Orestes, the son of Agamemnon

Declension

declension
formsingularplural
nominativeOrestēs
First-declension noun
—
genitiveOrestis
Orestī, Orestae
—
dativeOrestī
Orestae
—
accusativeOrestem
Orestēn
—
ablativeOreste—
vocativeOrestēs
Oresta
—

Ŏrestes, is and ae, m., = Ὀρέστης,
I. the son of Agamemnon and Clytœmnestra, who avenged his father's death by slaying his mother, and, in company with his faithful friend Pylades and his sister Iphigenia, priestess of Diana in the Tauric Chersonese, carried away the image of Diana to Italy, near Aricia, Plaut. Capt. 3, 4, 30: Agamemnonius Orestes, Verg. A. 4, 471: dico vicisse Oresten, Enn. ap. Non. 306, 28 (Trag. v. 191 Vahl.): cum Pylades Orestem se esse diceret, Cic. Lael. 7, 24: clamantem nomen Orestis, Ov. H. 8, 9: quod fuit Argolico juvenis Phoceus Orestae, id. Am. 2, 6, 15 (vulg. Oresti).—Voc.: tristis Oresta, Ov. Tr. 1, 5, 22.—
B. Transf., a tragedy of Euripides, founded on the story of Orestes: cum Orestem fabulam doceret Euripides, Cic. Tusc. 4, 29, 63.—Hence,
II. Orestē-us, a, um, adj., = Ὀρεστεῖος, of or belonging to Orestes, Orestean: Diana, whose image was carried away by Orestes to Aricia, Ov. M. 15, 489.

Origins

Borrowed from Ancient Greek Ὀρέστης (Oréstēs).

In the Academy Smith's classical dictionaries

Quick answers

What does Orestēs mean in Latin?
Orestēs, a proper noun, means “Orestes, the son of Agamemnon”.
What is the genitive of Orestēs?
The genitive singular is Orestis. Orestēs is masculine, variously declined, third declension, first declension.
How do you pronounce Orestēs?
In classical Latin, [ɔˈrɛs.teːs]; in ecclesiastical (church) Latin, [oˈrɛs.tes].